﻿#include <stdio.h>
#include <string.h>
#include <iomanip>
#include <iostream>

#include "md5.h"
using namespace lyramilk::cryptology;
using namespace std;

typedef md5_buf::ctx MD5_CTX;

/*
typedef struct
{
	unsigned int count[2];
	unsigned int state[4];
	unsigned char buffer[64];
}MD5_CTX;
*/

#define F(x,y,z) ((x & y) | (~x & z))
#define G(x,y,z) ((x & z) | (y & ~z))
#define H(x,y,z) (x^y^z)
#define I(x,y,z) (y ^ (x | ~z))
#define ROTATE_LEFT(x,n) ((x << n) | (x >> (32-n)))
#define FF(a,b,c,d,x,s,ac) \
{ \
	a += F(b,c,d) + x + ac; \
	a = ROTATE_LEFT(a,s); \
	a += b; \
}
#define GG(a,b,c,d,x,s,ac) \
{ \
	a += G(b,c,d) + x + ac; \
	a = ROTATE_LEFT(a,s); \
	a += b; \
}
#define HH(a,b,c,d,x,s,ac) \
{ \
	a += H(b,c,d) + x + ac; \
	a = ROTATE_LEFT(a,s); \
	a += b; \
}
#define II(a,b,c,d,x,s,ac) \
{ \
	a += I(b,c,d) + x + ac; \
	a = ROTATE_LEFT(a,s); \
	a += b; \
}
void MD5Init(MD5_CTX *context);
void MD5Update(MD5_CTX *context,unsigned char *input,unsigned int inputlen);
void MD5Final(MD5_CTX *context,unsigned char digest[16]);
void MD5Transform(unsigned int state[4],unsigned char block[64]);
void MD5Encode(unsigned char *output,unsigned int *input,unsigned int len);
void MD5Decode(unsigned int *output,unsigned char *input,unsigned int len);

unsigned char PADDING[]={0x80,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};

void MD5Init(MD5_CTX *context)
{
	context->count[0] = 0;
	context->count[1] = 0;
	context->state[0] = 0x67452301;
	context->state[1] = 0xEFCDAB89;
	context->state[2] = 0x98BADCFE;
	context->state[3] = 0x10325476;
}
void MD5Update(MD5_CTX *context,unsigned char *input,unsigned int inputlen)
{
	unsigned int i = 0,index = 0,partlen = 0;
	index = (context->count[0] >> 3) & 0x3F;
	partlen = 64 - index;
	context->count[0] += inputlen << 3;
	if(context->count[0] < (inputlen << 3))
		context->count[1]++;
	context->count[1] += inputlen >> 29;

	if(inputlen >= partlen)
	{
		memcpy(&context->buffer[index],input,partlen);
		MD5Transform(context->state,context->buffer);
		for(i = partlen;i+64 <= inputlen;i+=64)
			MD5Transform(context->state,&input[i]);
		index = 0;
	}
	else
	{
		i = 0;
	}
	memcpy(&context->buffer[index],&input[i],inputlen-i);
}

void MD5Final(MD5_CTX *context,unsigned char digest[16])
{
	unsigned int index = 0,padlen = 0;
	unsigned char bits[8];
	index = (context->count[0] >> 3) & 0x3F;
	padlen = (index < 56)?(56-index):(120-index);
	MD5Encode(bits,context->count,8);
	MD5Update(context,PADDING,padlen);
	MD5Update(context,bits,8);
	MD5Encode(digest,context->state,16);
}

void MD5Encode(unsigned char *output,unsigned int *input,unsigned int len)
{
	unsigned int i = 0,j = 0;
	while(j < len)
	{
		output[j] = input[i] & 0xFF;
		output[j+1] = (input[i] >> 8) & 0xFF;
		output[j+2] = (input[i] >> 16) & 0xFF;
		output[j+3] = (input[i] >> 24) & 0xFF;
		i++;
		j+=4;
	}
}
void MD5Decode(unsigned int *output,unsigned char *input,unsigned int len)
{
	unsigned int i = 0,j = 0;
	while(j < len)
	{
		output[i] = (input[j]) |
			(input[j+1] << 8) |
			(input[j+2] << 16) |
			(input[j+3] << 24);
		i++;
		j+=4;
	}
}
void MD5Transform(unsigned int state[4],unsigned char block[64])
{
	unsigned int a = state[0];
	unsigned int b = state[1];
	unsigned int c = state[2];
	unsigned int d = state[3];
	unsigned int x[64];
	MD5Decode(x,block,64);
	FF(a, b, c, d, x[ 0], 7, 0xd76aa478);
	FF(d, a, b, c, x[ 1], 12, 0xe8c7b756);
	FF(c, d, a, b, x[ 2], 17, 0x242070db);
	FF(b, c, d, a, x[ 3], 22, 0xc1bdceee);
	FF(a, b, c, d, x[ 4], 7, 0xf57c0faf);
	FF(d, a, b, c, x[ 5], 12, 0x4787c62a);
	FF(c, d, a, b, x[ 6], 17, 0xa8304613);
	FF(b, c, d, a, x[ 7], 22, 0xfd469501);
	FF(a, b, c, d, x[ 8], 7, 0x698098d8);
	FF(d, a, b, c, x[ 9], 12, 0x8b44f7af);
	FF(c, d, a, b, x[10], 17, 0xffff5bb1);
	FF(b, c, d, a, x[11], 22, 0x895cd7be);
	FF(a, b, c, d, x[12], 7, 0x6b901122);
	FF(d, a, b, c, x[13], 12, 0xfd987193);
	FF(c, d, a, b, x[14], 17, 0xa679438e);
	FF(b, c, d, a, x[15], 22, 0x49b40821);


	GG(a, b, c, d, x[ 1], 5, 0xf61e2562);
	GG(d, a, b, c, x[ 6], 9, 0xc040b340);
	GG(c, d, a, b, x[11], 14, 0x265e5a51);
	GG(b, c, d, a, x[ 0], 20, 0xe9b6c7aa);
	GG(a, b, c, d, x[ 5], 5, 0xd62f105d);
	GG(d, a, b, c, x[10], 9,  0x2441453);
	GG(c, d, a, b, x[15], 14, 0xd8a1e681);
	GG(b, c, d, a, x[ 4], 20, 0xe7d3fbc8);
	GG(a, b, c, d, x[ 9], 5, 0x21e1cde6);
	GG(d, a, b, c, x[14], 9, 0xc33707d6);
	GG(c, d, a, b, x[ 3], 14, 0xf4d50d87);
	GG(b, c, d, a, x[ 8], 20, 0x455a14ed);
	GG(a, b, c, d, x[13], 5, 0xa9e3e905);
	GG(d, a, b, c, x[ 2], 9, 0xfcefa3f8);
	GG(c, d, a, b, x[ 7], 14, 0x676f02d9);
	GG(b, c, d, a, x[12], 20, 0x8d2a4c8a);


	HH(a, b, c, d, x[ 5], 4, 0xfffa3942);
	HH(d, a, b, c, x[ 8], 11, 0x8771f681);
	HH(c, d, a, b, x[11], 16, 0x6d9d6122);
	HH(b, c, d, a, x[14], 23, 0xfde5380c);
	HH(a, b, c, d, x[ 1], 4, 0xa4beea44);
	HH(d, a, b, c, x[ 4], 11, 0x4bdecfa9);
	HH(c, d, a, b, x[ 7], 16, 0xf6bb4b60);
	HH(b, c, d, a, x[10], 23, 0xbebfbc70);
	HH(a, b, c, d, x[13], 4, 0x289b7ec6);
	HH(d, a, b, c, x[ 0], 11, 0xeaa127fa);
	HH(c, d, a, b, x[ 3], 16, 0xd4ef3085);
	HH(b, c, d, a, x[ 6], 23,  0x4881d05);
	HH(a, b, c, d, x[ 9], 4, 0xd9d4d039);
	HH(d, a, b, c, x[12], 11, 0xe6db99e5);
	HH(c, d, a, b, x[15], 16, 0x1fa27cf8);
	HH(b, c, d, a, x[ 2], 23, 0xc4ac5665);


	II(a, b, c, d, x[ 0], 6, 0xf4292244);
	II(d, a, b, c, x[ 7], 10, 0x432aff97);
	II(c, d, a, b, x[14], 15, 0xab9423a7);
	II(b, c, d, a, x[ 5], 21, 0xfc93a039);
	II(a, b, c, d, x[12], 6, 0x655b59c3);
	II(d, a, b, c, x[ 3], 10, 0x8f0ccc92);
	II(c, d, a, b, x[10], 15, 0xffeff47d);
	II(b, c, d, a, x[ 1], 21, 0x85845dd1);
	II(a, b, c, d, x[ 8], 6, 0x6fa87e4f);
	II(d, a, b, c, x[15], 10, 0xfe2ce6e0);
	II(c, d, a, b, x[ 6], 15, 0xa3014314);
	II(b, c, d, a, x[13], 21, 0x4e0811a1);
	II(a, b, c, d, x[ 4], 6, 0xf7537e82);
	II(d, a, b, c, x[11], 10, 0xbd3af235);
	II(c, d, a, b, x[ 2], 15, 0x2ad7d2bb);
	II(b, c, d, a, x[ 9], 21, 0xeb86d391);
	state[0] += a;
	state[1] += b;
	state[2] += c;
	state[3] += d;
}



md5_key::md5_key()
{
	memset(key,0,sizeof(key));
}

md5_key::md5_key(const md5_key& o)
{
	operator =(o);
}

md5_key& md5_key::operator =(const md5_key& o)
{
	memcpy(key,o.key,sizeof(key));
	return *this;
}

lyramilk::data::string md5_key::str16()
{
	lyramilk::data::stringstream  ss;
	for(int i=4;i<12;++i){
		ss << std::hex << std::setw(2) << std::setfill('0') << (unsigned int)(unsigned char)key[i];
	}
	return ss.str();
}

lyramilk::data::string md5_key::str32()
{
	lyramilk::data::stringstream  ss;
	for(int i=0;i<16;++i){
		ss << std::hex << std::setw(2) << std::setfill('0') << (unsigned int)(unsigned char)key[i];
	}
	return ss.str();
}

md5_buf::int_type md5_buf::overflow(md5_buf::int_type c)
{
	sync();
	return sputc((char)c);
}

md5_buf::int_type md5_buf::underflow()
{
	md5_buf::int_type v = sync();
	if(v == traits_type::eof()){
		return v;
	}
	return sgetc();
}

int md5_buf::sync()
{
	if(pptr() != pbase()){
		MD5Update(&context, (unsigned char*)pbase(), (unsigned int)(pptr() - pbase()));
	}
	ctx tmp = context;
	MD5Final(&tmp,(unsigned char*)getbuf.data());

	setp(putbuf.data(),putbuf.data() + putbuf.size());
	setg(getbuf.data(),getbuf.data(),getbuf.data() + getbuf.size());
	return 0;
}

md5_buf::md5_buf()
{
	MD5Init(&context);

	putbuf.assign(0x4000,0);
	setp(putbuf.data(),putbuf.data() + putbuf.size());

	getbuf.assign(16,0);
	setg(getbuf.data(),getbuf.data() + getbuf.size(),getbuf.data() + getbuf.size());
}


md5::md5()
	:std::basic_iostream<char>(&sb)
{
}

md5_key md5::get_key()
{
	md5_key rt;
	read(rt.key,sizeof(rt.key));
	return rt;
}

lyramilk::data::string md5::str16()
{
	return get_key().str16();
}

lyramilk::data::string md5::str32()
{
	return get_key().str32();
}